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Fuel pump problem 99 Chevy Tahoe 5.7

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New User

Sep 3, 2011, 4:12 PM

Post #1 of 4 (2273 views)
Fuel pump problem 99 Chevy Tahoe 5.7 Sign In

I had to replace the heads on my 5.7 99 Tahoe and after putting the engine back together the fuel pump will not turn on. The fuel pump worked fine before the repair and if I jump the relay the fuel pump will turn on. The fuel pressure is good with it turns on, I have checked all the ground wires and they all seem to be hooked up. I cant figure it out, any help?

New User

Sep 3, 2011, 4:33 PM

Post #2 of 4 (2257 views)
Re: Fuel pump problem 99 Chevy Tahoe 5.7 [In reply to] Sign In

I forgot to mention that I replaced the relay with a new one and it still wont start

Veteran / Moderator
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Sep 3, 2011, 5:13 PM

Post #3 of 4 (2250 views)
Re: Fuel pump problem 99 Chevy Tahoe 5.7 [In reply to] Sign In

If you bypass the fuel pump relay and have the pump running, will the engine start?

Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 3, 2011, 5:19 PM

Post #4 of 4 (2247 views)
Re: Fuel pump problem 99 Chevy Tahoe 5.7 [In reply to] Sign In

The PCM supplies trigger power to the relay on the Dk green with white wire. Check to see if you are getting that during the first 2 seconds of "key on" and once it starts cranking.
You should also check for spark when cranking


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.


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